/Engine/Source/Runtime/Engine/Public/Animation/AnimCurveMetadata.h
Renames a curve metadata entry. Metadata is preserved, but assigned to a different curve name.
true if the rename was successful (the old name was found and the new name didnt collide with an existing entry)
virtual bool RenameCurveMetaData ( [FName](API\Runtime\Core\UObject\FName) OldName, [FName](API\Runtime\Core\UObject\FName) NewName )